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Joint surface contour, repair material and weathering agent
solution will all effect the transverse strength of the repaired
denture base. In this study, Luciton 199 ( Dentsply, USA ) was
used as the denture base substrate with diff-erent repair-joint
designs (butt, round, and 45 degree bevel ). Specimens of
denture base acrylic resins were repaired with autopolymerized (
Repair Materi-al, Dentsply USA ) and visible light-cured (
Triad, Dentsply, USA ) repair mat-erials. Repaired specimens
were soaked in 99.5 % ethanol ( as a weathering agentsolution )
at 37'C for different time periods, their transverse strengths
were then measured by a three - point bending test with a
universal testing machine. ( AGS-1000D, SHIMADZU, JAPAN, cross-
head speed : 5mm / min ) Instead of beingsoaked in 99.5 %
ethanol, the control group was in distilled water.
Scanningelectron microscope ( SEM ) and optical microscope were
used to examine the fra-cture patterns and surfaces
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